Answer:
3
-2x +5=0
Step-by-step explanation:
Combine liked terms:
3+5x+x-1x+6+2=7x+3
3+6x-1x+8=7x+3
3+5x+8=7x+3
Subtract 3: 3+5x+8-3=7x+3-3
3+5x+5=7x
Now subtract 7x:
3+5x+5-7x=7x-7x
If you want combine liked terms:
3-7x+5x+5=0
3-2x+5=0
Hope this helps!
Answer:
D
Step-by-step explanation:
On the X side they add 2 every time to reach the next number needed. For example if it was to keep going the nect x would be 13
Answer:
The speed on motorboat is 20 mph
Step-by-step explanation:
here, we want to find the speed on the motorboat
if he has a speed of x mph on the motor boat, his speed on the ski will be (x + 10) mph
The total hours is 4 hours
Mathematically; speed = distance/time
Time on ski is 27/x+ 10
Time on motor boat is 62/x
The addition of both is 4
Thus;
27/(x + 10) + 62/x = 4
27(x) + 62(x + 10) = 4(x)(x + 10)
27x + 62x + 620 = 4(x^2 + 10x)
89x + 620 = 4x^2 + 40x
4x^2 -49x-620 = 0
using the quadratic formula;
{-b ± √(b^2-4ac)}/2a
where a = 4, b = -49 and c = -620
= 49 ± √(-49)^2-4(4)(-620)/8
So we have
49+ 111/8 or 49-111/8
Speed cannot be negative
(49 + 111)/8
= 20 mph
Root3 would be between 1 and 2 on the number line. This is known because 1 squared is 1, and 2 squared is 4.
the answer should be C. 5.27
